/* Modern Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary: #4361ee;
    --primary-hover: #3a56d4;
    --secondary: #3f37c9;
    --success: #4cc9f0;
    --danger: #f72585;
    --dark: #2b2d42;
    --light: #f8f9fa;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-600: #6c757d;
    --gray-800: #343a40;
    --bg-body: #f4f6f8;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-body);
    color: var(--gray-800);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.15s ease-in-out;
}

a:hover {
    color: var(--primary-hover);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* Navbar */
nav {
    background-color: white;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav a {
    color: var(--gray-600);
    font-weight: 500;
    margin-left: 1.5rem;
}

nav a:first-child {
    margin-left: 0;
}

nav a:hover, nav a.active {
    color: var(--primary);
}

nav .brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark);
    letter-spacing: -0.5px;
}

/* Cards */
.card {
    background: white;
    border-radius: 1px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.03), 0 4px 6px -2px rgba(0, 0, 0, 0.01);
    padding: 2rem;
    border: 1px solid rgba(0,0,0,0.02);
}

/* Buttons */
.btn {
    display: inline-block;
    font-weight: 500;
    text-align: center;
    vertical-align: middle;
    user-select: none;
    padding: 0.5rem 1rem;
    font-size: 0.95rem;
    line-height: 1.5;
    border-radius: 0.375rem;
    transition: all 0.15s ease-in-out;
    border: 1px solid transparent;
    cursor: pointer;
}

.btn.primary {
    color: #fff;
    background-color: var(--primary);
    border-color: var(--primary);
    box-shadow: 0 1px 2px rgba(67, 97, 238, 0.3);
}

.btn.primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn.success {
    color: #fff;
    background-color: #2a9d8f;
    border-color: #2a9d8f;
}

.btn.success:hover {
    background-color: #21867a;
    transform: translateY(-1px);
}

/* Forms */
input[type="text"], input[type="number"], select {
    display: block;
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--gray-800);
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid var(--gray-300);
    border-radius: 0.375rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

input:focus, select:focus {
    border-color: var(--primary);
    outline: 0;
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.15);
}

/* Tables */
table {
    width: 100%;
    margin-bottom: 1rem;
    color: var(--gray-800);
    border-collapse: separate;
    border-spacing: 0;
}

table th,
table td {
    padding: 1rem;
    vertical-align: top;
    border-top: 1px solid var(--gray-200);
}

table thead th {
    vertical-align: bottom;
    border-bottom: 2px solid var(--gray-200);
    background-color: var(--gray-100);
    color: var(--gray-600);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

table tr:last-child td {
    border-bottom: 1px solid var(--gray-200);
}

table tr:hover td {
    background-color: rgba(67, 97, 238, 0.02);
}

/* Alerts */
.alert {
    position: relative;
    padding: 1rem 1rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: 0.375rem;
}

.alert-success {
    color: #0f5132;
    background-color: #d1e7dd;
    border-color: #badbcc;
}

/* Utilities */
.shadow-sm { box-shadow: 0 .125rem .25rem rgba(0,0,0,.075)!important; }
.mb-3 { margin-bottom: 1rem!important; }
.mt-3 { margin-top: 1rem!important; }

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: #f1f1f1; 
}
::-webkit-scrollbar-thumb {
    background: #c1c1c1; 
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8; 
}